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Need simplified circuit diagram

Tiny
M551
  • MEMBER
  • 2003 CHEVROLET IMPALA
  • 6 CYL
  • 2WD
  • AUTOMATIC
Car is 2003 Impala, 3.8-
Would like to know where I might find an easy to read description/diagram of the ignition circuit for this car that shows the directional flow of current and all the components with-in the circuit (drawings, pictured). Wire diagrams do me no good.

Trying to locate short in ignition circuit- The smaller, fuseable linked pink wire (located on side of fuse box in engine compartment, above the two heavy cables to battery and starter) burns between it's post and it's fuseable link when key is turned to START. The pink wire's post and the heavy cables post is connected by a metal bar.

The starter was tested as good.

Thank you.
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Wednesday, August 3rd, 2011 AT 1:07 AM

8 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
If it blows in the start position then the only diagram you need is the starter wire diagram there is a short somewhere on that circuit. Sounds like the fuse link that comes off the underhood fuse box which feeds power to the switched part of the starter relay then goes to the purple wire feeding the starter solenoid so your short should be somewhere along there. Or are you blowing the fuse link to the alternator?
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Wednesday, August 3rd, 2011 AT 2:41 AM
Tiny
M551
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  • 14 POSTS
Attached is two pictures of the pink wire that blows/burns- from the top post it goes behind the fusebox to where, I don't know- it's short and ends behind the box, attached to something with-in the box-
The two heavier cables are attached to a second post, below the pink wire's post- both post are connected by a metal bar.
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Wednesday, August 3rd, 2011 AT 3:23 AM
Tiny
M551
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Don't know if the fuse blown fuse link goes to the alternator but I will check the things on your diagram-
Thank you
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Wednesday, August 3rd, 2011 AT 3:27 AM
Tiny
M551
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Second picture did not load- hope it does here
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Wednesday, August 3rd, 2011 AT 3:29 AM
Tiny
SATURNTECH9
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Thats the one I was talking about it runs from underhood junction block to underhood junction block in the second underhood junction block it runs the switch side of the crank relay that sends the power thru the switched side of the relay then comes out as purple to the starter solenoid its a pretty straight run to the starter.
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Wednesday, August 3rd, 2011 AT 3:35 AM
Tiny
SATURNTECH9
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Your welcome keep me posted.
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Wednesday, August 3rd, 2011 AT 4:55 AM
Tiny
M551
  • MEMBER
  • 14 POSTS
I wont be able to get to the car until Sunday but is it possible that the crank relay itself could be shorting to ground?
I'm more awake now than last night so what I'm getting is that when 1-turning the ign key to START
2-the pink wire is energized through the battery/starter post
3- the pink wire sends current to the crank relay
4-and the crank relay sends current to the purple wire connected to the starter solenoid.
That's it?
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Wednesday, August 3rd, 2011 AT 11:17 AM
Tiny
SATURNTECH9
  • MECHANIC
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You can try this with the battery discounted pull the crank Relay. Then leave the relay out unhook the purple wire from the starter check from the purple wire at the starter see if there is a short to ground that should narrow down a little. That wire sends power to the starter when the crank relay is energized the power just sits there at the relays switched part till the relay is is energized then sends power to the purple wire to the starter.I think there is just a short to ground from the relay somewhere to the starter on that purple wire.
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Wednesday, August 3rd, 2011 AT 3:05 PM

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